Dehumidifier displays E5 and will not start; sometimes accompanied by clicking from the control board or relay.

Safety: Unplug the unit. The compressor circuit carries high voltage; only test live circuits if you are trained and equipped.

Steps:

• Ventilation check: Ensure the rear and sides of the dehumidifier have at least 12 inches of clearance and that the air filter is clean. Overheating can trigger E5.
• Cool-down: If the unit has been running continuously in a hot room, unplug it for 1–2 hours to allow the compressor to cool, then retry.
• Access compressor compartment: Remove the rear or side panel to expose the compressor, start relay, and overload protector.
• Inspect wiring and connectors: Look for burnt terminals on the compressor, melted relay housing, or loose wires. Replace any obviously damaged components.
• Test start relay/overload: With power disconnected, remove the relay/overload assembly from the compressor and check for continuity per Honeywell’s specs. Replace the assembly if open or rattling internally.
• Compressor test: Measure resistance between the compressor terminals (C-R, C-S, R-S). If readings are shorted to ground or open, the compressor is failed and the unit is generally not economical to repair.

Note: If you suspect a sealed system or compressor failure, contact a professional; replacing the entire unit is often more cost‑effective.